How to Write a Sample letter

This is the letter to convey my apology for being selfish to a true friend. First of all I should regret for my behaviour and I regret for it in a very precise manner. I am not in a position to face your face also. I was been a very much selfish person to you though you behave so selfless to me. I tried to change myself but I could not I request you to condone me for my actions and accept my apologies. This is the first time things going in wrong manner and I feel for it in a wide range of manner. I didn’t expect this will be the thing that we will face. I request you to accept my apologies. Never ever leave me alone. I promise you I will change myself completely at some day.